rackerlabs/stacktach — pull request #233 by ramielrowe (2013-10-24 17:46:43+00:00)
Title: Using new exist object in callback

The exist we're provided from the callback may have cached queries
from before it was serialized. We don't want to use them as
they could have been lost somewhere in the process forking.
So, grab a new InstanceExists object from the database and use it.